Nothing definite. 60s UK, but not Sunbeam, Triumph, Jaguar, MG, Austin Healey, Lotus, Jensen, and I don't think Bristol or any of kit car makes. Could be something like AC Greyhound or even Peerless???

Sandie wrote

... set largely in a scrapyard: Some surprisingly recent cars sighted there.

The scrappage scheme could explain some of them - passed through to a salvage yard.